Init. Commit

finals/tollgate-iis-dotnet-reverse-medium/solve/solve.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+from pathlib import Path
+import argparse, base64, hashlib, json, lzma, marshal, os, plistlib, re, struct, subprocess, sys, zipfile, zlib
+
+def xor(data, key):
+    return bytes(b ^ key[i % len(key)] for i, b in enumerate(data))
+
+def find_after(data, marker):
+    off = data.index(marker) + len(marker)
+    ln = struct.unpack_from('<I', data, off)[0]
+    off += 4
+    return data[off:off+ln]
+
+def utf16_strings(data):
+    return [m.group(0).decode('utf-16le') for m in re.finditer(rb'(?:[ -~]\x00){8,}', data)]
+def main():
+    ap = argparse.ArgumentParser(); ap.add_argument('dll', nargs='?', default='../public/TollgateIis.dll')
+    args = ap.parse_args(); vals = utf16_strings(Path(args.dll).read_bytes())
+    enc = next(v[8:] for v in vals if v.startswith('ROUTEv3:'))
+    key = next(v for v in vals if v == '31415926535897932384626433832795')
+    iv = next(v for v in vals if v == '27182818284590452353602874713526')
+    p = subprocess.run(['openssl','enc','-d','-aes-128-cbc','-K',key,'-iv',iv,'-nosalt','-A','-base64'],
+                       input=enc, text=True, stdout=subprocess.PIPE, check=True)
+    print(json.loads(p.stdout)['handler'])
+if __name__ == '__main__': main()